The position of King of Arms of the Order of the Garter, usually known as Garter King of Arms, was created sometime around 1415, and Bruges appointed to it. His father's will, dated July 1415, refers to William Bruges as both Guyenne and Garter King of Arms. After this, the next mention of Bruges in the position is 13 September 1417. It was the first time a king of arms had been specifically appointed for the service of an order of chivalry. By virtue of this office, he held permanent authority over the provincial kings of arms. , the second ever recipient of the Order Bruges's appointment as the first Garter King of Arms coincided with a series of moves to regulate heraldic matters. In June 1417 the king clamped down on the unauthorized wearing of coat armour. In September the duke of Clarence ruled on matters of precedence between the heralds and the serjeants-at-arms. In January 1421 the English heralds held their first chapter and directed that a common seal for that office be made. Resolutions were to govern the office of arms and its members, with chapters summoned by Garter. In the same year, as part of Henry's revival of the Order of the Garter, some statutes of the order were revised and at about the same time many heraldic stall plates of former companions were set up in St. George's Chapel, Windsor. Bruges was also responsible for producing his Bruges Garter Book around 1430, which is the earliest known armorial of the order. In 1421 Bruges took part in the coronation of Queen Catherine, and in the following year he officiated at Henry V's funeral. Under Henry VI there was scarcely a year in which he was not sent on at least one mission, sometimes staying abroad for many months. He was usually concerned with France, but he also visited Normandy and Brittany, Flanders, Hainault and Holland, Scotland, Spain, Portugal, and Italy.
In about 1450 he rebuilt at his own cost St George's Church in the town of Stamford, in Lincolnshire. In the chancel he set up a series of stained glass windows, at the east end and on either side of the choir, depicting the 25 Founder Knights of the Order of the Garter and of King Edward III the Sovereign of the Order and of St George, the patron saint. When Elias Ashmole visited the church in 1664 he reported concerning the stained glass images "I found so broken and defaced that no tolerable draft of them could be taken fit to exhibit to the reader's satisfaction". John Anstis reported that only the images of the king and three knights remained. Little remains of the windows today apart from a collection of garter panes in the north chancel window and a few fragments in the south window. However the structure of the church built by Bruges remains intact.
Marriage and children
He married, before 1415, Agnes Haddon, by whom he had three daughters including:
Katherine Bruges, who married John Smert, who succeeded her father as Garter King of Arms.
Death and burial
Bruges died on 9 March 1450 on his sizeable estate in Kentish Town. He was buried in St George's Church, Stamford, the church he rebuilt and to which he bequeathed much property and vessels of gold and silver.
